With Black Friday still the most popular day to shop during the holidays according to a new CBS News poll, more retailers than ever will now be open on Thanksgiving Day, even as retail experts warn not every holiday deal is as great as it sounds.

When San Jose resident Victor Karazija received a 30 percent coupon plus $20 worth of Kohl’s Cash he purchased two ties, but before paying Karazija said he had already done the math. He figured on a $45 purchase if he applied the 30 percent coupon first then the $20 Kohl’s Cash he would only owe $11.50. But when he handed over the coupons to the sales rep he said he got a big surprise.